Ubuntu 25.10 is switching to Chrony for Network Time Security (NTS) support, joining RHEL and SUSE. Learn how this improves security, accuracy, and cloud compatibility—plus steps to prepare for the transition.
Why Ubuntu is Switching from systemd-timesync to Chrony
Ubuntu 25.10 is making a significant change by replacing systemd-timesync with Chrony as its default Network Time Protocol (NTP) implementation.
This strategic shift aligns Ubuntu with enterprise-grade Linux distributions like Red Hat Enterprise Linux (RHEL) and SUSE Linux Enterprise, which already rely on Chrony for precise time synchronization.
The primary motivation? Network Time Security (NTS)—a more robust protocol that mitigates risks like spoofing and man-in-the-middle attacks. Unlike traditional NTP, NTS encrypts time synchronization data, making it indispensable for security-conscious enterprises and cloud environments.
Key Benefits of Chrony for Ubuntu 25.10
Enhanced Security: NTS support ensures encrypted time synchronization, critical for compliance-heavy industries like finance, healthcare, and government IT.
Better Accuracy: Chrony outperforms systemd-timesync in unstable network conditions, making it ideal for cloud deployments and distributed systems.
Enterprise Adoption: With RHEL and SUSE already using Chrony, Ubuntu’s move ensures compatibility in hybrid cloud and multi-Linux environments.
Did You Know? Chrony is already available in Ubuntu 25.04’s main archive and select Ubuntu Cloud images, signaling a gradual rollout before the official 25.10 release.
When Will the Transition Happen?
The default switch to Chrony is expected in early June, coinciding with Ubuntu 25.10’s development cycle. System administrators and DevOps teams should prepare for:
Automated updates replacing systemd-timesync.
Configuration adjustments for NTS-enabled time servers.
Compatibility checks for legacy systems still relying on traditional NTP.
For technical details, refer to the official Ubuntu mailing list and Launchpad bug tracker.
Why This Matters for Businesses and Developers
Higher Security Standards: NTS is becoming a best practice for enterprises, especially those handling sensitive data.
Cloud Optimization: Chrony’s resilience in AWS, Azure, and Google Cloud environments makes it a superior choice.
Future-Proofing: Ubuntu’s adoption signals long-term support for Chrony, reducing migration headaches later.
FAQs: Ubuntu 25.10 and Chrony Adoption
Q: Can I manually switch to Chrony before Ubuntu 25.10?
A: Yes—Chrony is already in Ubuntu’s main repository (sudo apt install chrony).
Q: Will this affect Docker/Kubernetes deployments?
A: Only if containers rely on host time synchronization; verify your NTP settings.
Q: Is NTS backward-compatible with older NTP clients?
A: No—legacy systems may require updates or intermediary time servers.
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